If I remember right the last car I pushed in the shop was a AFP car at 11:30PM on a Saturday night. Don't worry I covered up his stickers with blue tape.
Better be careful Pog, between Alans clutch and Johns trans you may catch a bum converter just by hanging out with them.
Well when you have more than 5 customers the odds are one will break eventually. It could have been worse he could have been stuck on a bridge or broke at the track.
please show me an example of a car with too big of an intercooler.
I think the easiest way to visualize this is with a very specific case.
Take an air to air aftercooler, fixed inlet temperature, and fixed ambient temp.
Eic= aftercooler efficiency
Tin= temp into aftercooler
Tout= temp out of aftercooler
Tamb= Ambient temperature
Eic= (Tin-Tout)/(Tin-Tamb)
Graph intercooler efficiency vs. size of intercooler given the stated constants. You will get an asymptotic graph as it approaches 100% efficiency (decreasing rate of return for what you are putting in). Assuming you picked appropriate numbers for the Tin and Tamb, you want to size your intercooler to the size just before the graph “flat lines”
It is true as you increase the size of your intercooler you are increasing the efficiency of the system (getting the outlet air temp closer to ambient temp) but at an increase in system (turbo) lag and pressure drop and once the graph “flatlines” you really are not gaining anything.
With the volume of air that you're flowing the volume of the cold side is totally irrelevant, you're arguing miliseconds. As for pressure drop, you're assuming a fixed air volume going in and that's just not the way it works since the control system fights to maintain a fixed pressure at whatever point you take your reference signal from. The only realistic possible downside of putting in an intercooler that the math says is "too big" is the added weight, cost and/or effort to actually install it. There is a point of diminishing returns, but it certianly won't hurt anything hence my request for an actual example. Bottom line is you won't find one.
The math is great until you get to the real world and realise that it's only about 1/3 of what's really going on
keep in mind their is such thing as too big of an intercooler (or aftercooler as they should be called)
With the volume of air that you're flowing the volume of the cold side is totally irrelevant, you're arguing miliseconds.
As for pressure drop, you're assuming a fixed air volume going in and that's just not the way it works since the control system fights to maintain a fixed pressure at whatever point you take your reference signal from.
The only realistic possible downside of putting in an intercooler that the math says is "too big" is the added weight, cost and/or effort to actually install it. There is a point of diminishing returns, but it certainly won't hurt anything hence my request for an actual example. Bottom line is you won't find one.
The math is great until you get to the real world and realize that it's only about 1/3 of what's really going on
It is better to have an oversized intercooler than an undersized one.
For us enthusiasts that generally “thumb” stuff, you are 100% correct.
I know one alternative is to use a smaller intercooler and utilize a water/methanol kit to bridge the gap, but I would prefer not to introduce yet another system into the car. We'll see.
Corky Bell (a man that knows far more than any of us about this sort of thing) thinks water/meth injection area bandaid fix for an improperly designed system. I do not fully agree and think they do have their merits in certain situations, but I will say this: if your water injection system clogs and your tune depends on it...... BOOM!
and leaky systems can cause issues too.
Methanol definately has a place, but not really as a cooling agent primarily. The guys who are making big power with methanol injection are using it to actually replace a large quantity of fuel under boost, sometimes as high as 50%, and taking advantage of it's much higher octane rating in addition to the cooling effect.
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